Furman, Thomas de S. <br/><br/>
Intermittent sand filters - multiple loading 

 - Gainesville,   1955. 
<br/><br/> Wilson T. Calaway and George R. Grantham. Reprinted courtesy of Sewage and industrial Wastes, Vol. 27, Nš3, march, 1955    Engineering progrtess at the University of Florida, Suplement, Vol. IX, Nš 4, April, 1955. Technical paper series, Nš 106